Failed to parse query query is already defined – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when there is a duplicate definition of a query in the OpenSearch request. This could be due to a programming error or a misconfiguration. To resolve this issue, you should review your OpenSearch request and ensure that each query is uniquely defined. If you’re using a script or a tool to generate your queries, check that it’s not creating duplicate queries. Also, ensure that your OpenSearch version supports the queries you’re using. Lastly, check your OpenSearch logs for more details about the error.

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This guide will help you check for common problems that cause the log ” failed to parse [{}] query. [query] is already defined. ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index, query.

Log Context

Log “failed to parse [{}] query. [query] is already defined.” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 if (token == XContentParser.Token.FIELD_NAME) {
 currentFieldName = parser.currentName();
 } else if (token == XContentParser.Token.START_OBJECT) {
 if (QUERY_FIELD.match(currentFieldName; parser.getDeprecationHandler())) {
 if (query != null) {
 throw new ParsingException(parser.getTokenLocation(); "failed to parse [{}] query. [query] is already defined.";
 query = parseInnerQueryBuilder(parser);
 } else {
 if (singleFunctionFound) {


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